| Document And Entity Information | Feb. 28, 2024 |
| Document Information [Line Items] | |
| Entity, Registrant Name | Palomar Holdings, Inc. |
| Document, Type | 8-K |
| Document, Period End Date | Feb. 28, 2024 |
| Entity, File Number | 001-38873 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, Tax Identification Number | 83-3972551 |
| Entity, Address, Address Line One | 7979 Ivanhoe Avenue, Suite 500 |
| Entity, Address, City or Town | La Jolla |
| Entity, Address, State or Province | CA |
| Entity, Address, Postal Zip Code | 92037 |
| City Area Code | 619 |
| Local Phone Number | 567-5290 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | PLMR |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001761312 |
